Snappy Team 3c77e01459 1) Make the output pointer a local variable such it doesn't need a load add store on it's loop carried dependency chain. ...

2) Reduce the input pointer loop carried dependency chain from 7 cycles to 4 cycles by using pre-loading. This is a very subtle point.
3) Just brutally copy 64 bytes which removes a difficult to predict branch from the inner most loop. There is enough bandwidth to do so in the intrinsic cycles of the loop.
4) Implement limit pointers that include the slop region. This removes unnecessary instructions from the hot path.
5) It seems the removal of the difficult to predict branch has removed the code sensitivity to alignment, so remove the asm nop's.

PiperOrigin-RevId: 294692928

2020-04-11 04:40:29 +00:00

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